Telephone Area Codes in the
United States Listed in Alphabetical Order of States

The area codes listed below may change. Each state
may have more than one telephone area code. Some area codes may
be confined within only parts of a city within a state. For a
listing of US area codes by number in the numerical order
CLICK
HERE

When a split takes place,
some of the prefixes remain with the old area code and some move
to the new area code. Where can that information be found?

When a new area code is assigned, NANPA issues a press release
that provides an overview of how the new code will be used. If
the new area code will be used for a split, and if the list of
prefixes is available, it will be included in the press release.
Check the "Press
Releases" section of the web site. Details of each split,
once finalized, are included in a planning letter on our web
site. The planning letter typically contains prefix lists, maps,
dialing plans, and key dates. Check the "Planning
Letters" section of the web site.

With all of the area code splits that happen every year,
how can phone number databases be kept up to date?

Some companies have aggregated split-related area code and
prefix information to assist in updating phone number databases.
One example is Telcordia's ACSED product, described at www.trainfo.com.

Who publishes LATA maps?

LATA maps are available from several vendors. One way to identify
possible sources is to search the internet using the key words
"LATA maps".

What is area code 700 used for?

Area code 700 was assigned in 1983 on the eve of the introduction
of long distance competition in the US. The intent was that interexchange
carriers could use 700 numbers to implement new services quickly.
When a 700 number is dialed, the local exchange carrier processing
the call routes it to the presubscribed interexchange carrier,
unless the caller has overridden presubscription by dialing 101XXXX
before the number. Thus each interexchange carrier has access
to all 7.92 million 700 numbers. 700 numbers are different from
all other North American Numbering Plan numbers because the destinations
are not unique, and, in fact, depend on the network the caller
has selected.

What are area codes 880, 881, and 882 used for?

These codes provide a way to extend toll-free calling beyond
the borders of the country in which the party paying for the
calls resides. These codes have been used primarily to allow
Caribbean callers to reach toll free numbers in the US. With
this arrangement, the caller pays for the international segment
of the call (to the US gateway), and the called party pays for
the remainder. In theory, this concept can be implemented between
any of the countries sharing the NANP.

How does NANPA decide who is entitled to the assignment
of a NANP numbering resource; e.g., central office code, carrier
identification code?

NANPA follows assignment guidelines developed by the industry.
These guidelines specify who is entitled to an assignment, how
to apply, and what obligations the assignee must meet to retain
the assignment. The guidelines and applications forms may be
found on the Alliance for Telecommunications Industry Solutions
(ATIS) web site. The URL is http://www.atis.org/atis/clc/inc/incdocs.htm.

The NANP is the numbering plan for the Public Switched Telephone Network in the United States and its territories, Canada, Bermuda, and many Caribbean nations, including Anguilla, Antigua & Barbuda, Bahamas, Barbados, British Virgin Islands, Cayman Islands, Dominica, Dominican Republic, Grenada, Jamaica, Montserrat, St. Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Trinidad and Tobago, and Turks & Caicos